Neil Warnock has allowed the 32 year old coach to Bramall Lane. Blades Mad do not know what is going to be the circumstances with current fitness coach Dean Riddle.
Warnock told the Croydon Advertiser:"I can confirm that Carl has left the club and will join Sheffield United. I hope to have a new fitness coach in place very soon."
He has previously played with the Blades on loan in the defending role but didn't make any appearances.
More to follow...